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Reference.org
Trioxide
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<p>A trioxide is a <a href="/facts/Chemical_compound/37FXqqtv">compound</a> with three <a href="/facts/Oxygen/acyn6o8r">oxygen</a> atoms. For metals with the M2O3 formula there are several common structures. Al2O3, Cr2O3, Fe2O3, and V2O3 adopt the <a href="/facts/Corundum_structure/B7RRbcaE">corundum structure</a>. Many rare earth oxides adopt the "A-type rare earth structure" which is <a href="/facts/Hexagonal/DPzuCzWE">hexagonal</a>. Several others plus indium oxide adopt the "C-type rare earth structure", also called "bixbyite", which is <a href="/facts/Cubic_crystal_system/92Co7BKM">cubic</a> and related to the <a href="/facts/Fluorite_structure/5fAEzU1z">fluorite structure</a>. </p>